lessc_parser::func PHP Метод

    protected function func(&$func)
    {
        $s = $this->seek();
        if ($this->match('(%|[\\w\\-_][\\w\\-_:\\.]+|[\\w_])', $m) && $this->literal('(')) {
            $fname = $m[1];
            $sPreArgs = $this->seek();
            $args = array();
            while (true) {
                $ss = $this->seek();
                // this ugly nonsense is for ie filter properties
                if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value)) {
                    $args[] = array("string", "", array($name, "=", $value));
                } else {
                    $this->seek($ss);
                    if ($this->expressionList($value)) {
                        $args[] = $value;
                    }
                }
                if (!$this->literal(',')) {
                    break;
                }
            }
            $args = array('list', ',', $args);
            if ($this->literal(')')) {
                $func = array('function', $fname, $args);
                return true;
            } elseif ($fname == 'url') {
                // couldn't parse and in url? treat as string
                $this->seek($sPreArgs);
                if ($this->openString(")", $string) && $this->literal(")")) {
                    $func = array('function', $fname, $string);
                    return true;
                }
            }
        }
        $this->seek($s);
        return false;
    }